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/*-
* Copyright (c) 2010 Alistair Crooks <agc@NetBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LIBPAA_H_
#define LIBPAA_H_ 20100908
#include <sys/types.h>
#include <inttypes.h>
#include <stdio.h>
#define DEFAULT_HASH_ALG "SHA256"
enum {
PAA_CHALLENGE_SIZE = 128
};
/* constant and secret info for server side */
typedef struct paa_server_info_t {
char hostaddress[128]; /* host ip address */
char *secret; /* raw secret of server */
unsigned secretc; /* # of characters used */
char server_signature[512]; /* this is the encoded signature */
int server_signaturec; /* # of chars in encoded sig */
} paa_server_info_t;
/* used in server to formulate challenge */
typedef struct paa_challenge_t {
const char *realm; /* this is realm of challenge */
const char *domain; /* domain of challenge */
char challenge[512]; /* the output challenge */
int challengec; /* # of chars in challenge */
/* sub-parts of challenge */
char encoded_challenge[512]; /* encoded challenge part */
int encc; /* # of chars in encoded challenge */
} paa_challenge_t;
/* used in client to formulate response */
typedef struct paa_response_t {
const char *userid; /* identity to be used for signature */
const char *realm; /* realm that client wants */
char challenge[PAA_CHALLENGE_SIZE]; /* input challenge */
int challengec; /* # if chars in input */
char response[PAA_CHALLENGE_SIZE * 2]; /* output response */
int respc; /* # of chars in output */
} paa_response_t;
/* this struct holds the identity information in the paa response */
typedef struct paa_identity_t {
char userid[32]; /* verified identity */
char client[128]; /* client address */
char realm[128]; /* client realm */
char domain[128]; /* client domain */
int64_t timestamp; /* time of response */
} paa_identity_t;
/* support functions */
int paa_write_file(const char *, char *, unsigned);
int paa_read_file(const char *, char *, size_t);
/* server initialisations - one time */
int paa_server_init(paa_server_info_t *, unsigned);
/* body of pubkey access authentication challenge/response/check functionality */
int paa_format_challenge(paa_challenge_t *, paa_server_info_t *, char *, size_t);
int paa_format_response(paa_response_t *, netpgp_t *, char *, char *, size_t);
int paa_check_response(paa_challenge_t *, paa_identity_t *, netpgp_t *, char *);
/* who are ya? */
int paa_print_identity(FILE *, paa_identity_t *);
#endif
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